library(tidyverse)     # for data cleaning and plotting
library(lubridate)     # for date manipulation
library(openintro)     # for the abbr2state() function
library(palmerpenguins)# for Palmer penguin data
library(maps)          # for map data
library(ggmap)         # for mapping points on maps
library(gplots)        # for col2hex() function
library(RColorBrewer)  # for color palettes
library(sf)            # for working with spatial data
library(leaflet)       # for highly customizable mapping
library(carData)       # for Minneapolis police stops data
library(ggthemes)      # for more themes (including theme_map())
theme_set(theme_minimal())
# Starbucks locations
Starbucks <- read_csv("https://www.macalester.edu/~ajohns24/Data/Starbucks.csv")

starbucks_us_by_state <- Starbucks %>% 
  filter(Country == "US") %>% 
  count(`State/Province`) %>% 
  mutate(state_name = str_to_lower(abbr2state(`State/Province`))) 

# Lisa's favorite St. Paul places - example for you to create your own data
favorite_stp_by_lisa <- tibble(
  place = c("Home", "Macalester College", "Adams Spanish Immersion", 
            "Spirit Gymnastics", "Bama & Bapa", "Now Bikes",
            "Dance Spectrum", "Pizza Luce", "Brunson's"),
  long = c(-93.1405743, -93.1712321, -93.1451796, 
           -93.1650563, -93.1542883, -93.1696608, 
           -93.1393172, -93.1524256, -93.0753863),
  lat = c(44.950576, 44.9378965, 44.9237914,
          44.9654609, 44.9295072, 44.9436813, 
          44.9399922, 44.9468848, 44.9700727)
  )

#COVID-19 data from the New York Times
covid19 <- read_csv("https://raw.githubusercontent.com/nytimes/covid-19-data/master/us-states.csv")

Put your homework on GitHub!

If you were not able to get set up on GitHub last week, go here and get set up first. Then, do the following (if you get stuck on a step, don’t worry, I will help! You can always get started on the homework and we can figure out the GitHub piece later):

  • Create a repository on GitHub, giving it a nice name so you know it is for the 4th weekly exercise assignment (follow the instructions in the document/video).
  • Copy the repo name so you can clone it to your computer. In R Studio, go to file –> New project –> Version control –> Git and follow the instructions from the document/video.
  • Download the code from this document and save it in the repository folder/project on your computer.
  • In R Studio, you should then see the .Rmd file in the upper right corner in the Git tab (along with the .Rproj file and probably .gitignore).
  • Check all the boxes of the files in the Git tab under Stage and choose commit.
  • In the commit window, write a commit message, something like “Initial upload” would be appropriate, and commit the files.
  • Either click the green up arrow in the commit window or close the commit window and click the green up arrow in the Git tab to push your changes to GitHub.
  • Refresh your GitHub page (online) and make sure the new documents have been pushed out.
  • Back in R Studio, knit the .Rmd file. When you do that, you should have two (as long as you didn’t make any changes to the .Rmd file, in which case you might have three) files show up in the Git tab - an .html file and an .md file. The .md file is something we haven’t seen before and is here because I included keep_md: TRUE in the YAML heading. The .md file is a markdown (NOT R Markdown) file that is an interim step to creating the html file. They are displayed fairly nicely in GitHub, so we want to keep it and look at it there. Click the boxes next to these two files, commit changes (remember to include a commit message), and push them (green up arrow).
  • As you work through your homework, save and commit often, push changes occasionally (maybe after you feel finished with an exercise?), and go check to see what the .md file looks like on GitHub.
  • If you have issues, let me know! This is new to many of you and may not be intuitive at first. But, I promise, you’ll get the hang of it!

Instructions

  • Put your name at the top of the document.

  • For ALL graphs, you should include appropriate labels.

  • Feel free to change the default theme, which I currently have set to theme_minimal().

  • Use good coding practice. Read the short sections on good code with pipes and ggplot2. This is part of your grade!

  • When you are finished with ALL the exercises, uncomment the options at the top so your document looks nicer. Don’t do it before then, or else you might miss some important warnings and messages.

Warm-up exercises from tutorial

These exercises will reiterate what you learned in the “Mapping data with R” tutorial. If you haven’t gone through the tutorial yet, you should do that first.

Starbucks locations (ggmap)

  1. Add the Starbucks locations to a world map. Add an aesthetic to the world map that sets the color of the points according to the ownership type. What, if anything, can you deduce from this visualization?
world_map <- get_stamenmap(
   bbox = c(left = -180, bottom = -57, right = 179, top = 82.1), 
    maptype = "terrain",
    zoom = 2
)

ggmap(world_map)

#plotting the Starbucks data on my stamen map
ggmap(world_map) + 
  geom_point(data = Starbucks, 
             aes(x = Longitude, 
                 y = Latitude, 
                 color = `Ownership Type`),
             alpha = .3, 
             size = .1) +
  theme_map()

We can deduce that the majority of Starbucks locations in the United States are company owned, whereas the locations in Europe, Asia, and South America appear to be more joint ventures and licensed locations.

  1. Construct a new map of Starbucks locations in the Twin Cities metro area (approximately the 5 county metro area).
mn_starbucks <- Starbucks %>% 
  filter(`State/Province` %in% "MN")
twin_cities_map <- get_stamenmap(
    bbox = c(left = -94.4699, bottom = 44.4098, right = -91.6766, top = 45.4424), 
    maptype = "terrain",
    zoom = 9)

ggmap(twin_cities_map) +
   geom_point(data = mn_starbucks, 
             aes(x = Longitude, 
                 y = Latitude, 
                 color = `Ownership Type`),
             alpha = 1, 
             size = .7) +
  theme_map()

  1. In the Twin Cities plot, play with the zoom number. What does it do? (just describe what it does - don’t actually include more than one map).

The zoom number is connected to the amount of detail that will be shown in the mapping.

  1. Try a couple different map types (see get_stamenmap() in help and look at maptype). Include a map with one of the other map types.
twin_cities_map <- get_stamenmap(
    bbox = c(left = -94.4699, bottom = 44.4098, right = -91.6766, top = 45.4424), 
    maptype = "toner-2010",
    zoom = 9)

ggmap(twin_cities_map) +
   geom_point(data = mn_starbucks, 
             aes(x = Longitude, 
                 y = Latitude),
             alpha = 1, 
             size = .7) +
  theme_map()

  1. Add a point to the map that indicates Macalester College and label it appropriately. There are many ways you can do think, but I think it’s easiest with the annotate() function (see ggplot2 cheatsheet).
macalester_map <- get_stamenmap(
    bbox = c(left = -93.4863, bottom = 44.8185, right = -92.7880, top = 45.0766), 
    maptype = "toner-2010",
    zoom = 11)

ggmap(macalester_map) +
   geom_point(data = mn_starbucks, 
             aes(x = Longitude, 
                 y = Latitude),
             alpha = 1, 
             size = .7) +
  annotate(geom = "text", y = 44.9379, x = -93.1691, label = "Macalester College") +
  theme_map()

Choropleth maps with Starbucks data (geom_map())

The example I showed in the tutorial did not account for population of each state in the map. In the code below, a new variable is created, starbucks_per_10000, that gives the number of Starbucks per 10,000 people. It is in the starbucks_with_2018_pop_est dataset.

census_pop_est_2018 <- read_csv("https://www.dropbox.com/s/6txwv3b4ng7pepe/us_census_2018_state_pop_est.csv?dl=1") %>% 
  separate(state, into = c("dot","state"), extra = "merge") %>% 
  select(-dot) %>% 
  mutate(state = str_to_lower(state))

starbucks_with_2018_pop_est <-
  starbucks_us_by_state %>% 
  left_join(census_pop_est_2018,
            by = c("state_name" = "state")) %>% 
  mutate(starbucks_per_10000 = (n/est_pop_2018)*10000)
  1. dplyr review: Look through the code above and describe what each line of code does. The first line with the read_csv is creating a new dataset, labeled census_pop_est_2018, and reading the data from the URL in. The second line with the separate function (the separate function separates a character variable into multiple variables) removes the dots from the state names. The state data was presented with period preceding the state name and this removes that so the data can be joined with another dataset. The select(-dot) function additionally helps us get rid of the period that precedes the state name. The mutate and str_to_lower function in the next line creates a new column in which the state name is presented as lowercase. The next line begins by creating a new dataset called starbucks_with_2018_pop_est. This new dataset will be created using left_join to join together starbucks_us_by_state with the census population data. We then mutate to add another column that gives us the number of starbucks (n) divided by the estimated population multiplied by 10,000 to allow us to understand the number of starbucks stores per 10,000 people. This accounts for the population of each state.

  2. Create a choropleth map that shows the number of Starbucks per 10,000 people on a map of the US. Use a new fill color, add points for all Starbucks in the US (except Hawaii and Alaska), add an informative title for the plot, and include a caption that says who created the plot (you!). Make a conclusion about what you observe.

states_map <- map_data("state")



starbucks_with_2018_pop_est %>% 
  ggplot() +
  geom_map(map = states_map,
           aes(map_id = state_name,
               fill = n/est_pop_2018 * 10000)) +
  geom_point(data = Starbucks %>% filter(`Country` == "US", 
                                         `State/Province` != c("HI", "AK")),
             aes(x = Longitude, y = Latitude),
             size = .05,
             alpha = .2, 
             color = "goldenrod") +
expand_limits(x = states_map$long, y = states_map$lat) + 
  theme_map() +
  labs(title = "Number of Starbucks in Each State per 10,000 People", 
       fill = "" ,
       caption = "Created by Mackenzie Clarke") +
  scale_fill_viridis_c(option = "green")

  theme(legend.background = element_blank())
## List of 1
##  $ legend.background: list()
##   ..- attr(*, "class")= chr [1:2] "element_blank" "element"
##  - attr(*, "class")= chr [1:2] "theme" "gg"
##  - attr(*, "complete")= logi FALSE
##  - attr(*, "validate")= logi TRUE

There is a high density of Starbucks locations in Washington, Oregon, California, Colorado, Nevada, and Arizona. Perhaps this is because people on the East Coast prefer Dunkin Donuts over Starbucks :) Also, Starbucks was founded in Seattle, so maybe there are more Starbucks locations on the West Coast because of this.

A few of your favorite things (leaflet)

  1. In this exercise, you are going to create a single map of some of your favorite places! The end result will be one map that satisfies the criteria below.
  • Create a data set using the tibble() function that has 10-15 rows of your favorite places. The columns will be the name of the location, the latitude, the longitude, and a column that indicates if it is in your top 3 favorite locations or not. For an example of how to use tibble(), look at the favorite_stp_by_lisa I created in the data R code chunk at the beginning.

  • Create a leaflet map that uses circles to indicate your favorite places. Label them with the name of the place. Choose the base map you like best. Color your 3 favorite places differently than the ones that are not in your top 3 (HINT: colorFactor()). Add a legend that explains what the colors mean.

  • Connect all your locations together with a line in a meaningful way (you may need to order them differently in the original data).

  • If there are other variables you want to add that could enhance your plot, do that now.

mackenzie_fav_places <- tibble(
   place = c("Hai Hai", "Macalester College", "Bent Paddle Brewery", 
            "Lake Harriet", "True North Ranch", "Pine Tree Apple Orchard",
            "Minneapolis Institute of Art", "The Nook", "Superior Hiking Trail", "Home", "Half Moon Bay"),
  long = c(-93.26259135894995, -93.16940235841348, -92.12048604141492, 
           -93.30612131724241, -92.85301775841815, -92.95486944306221, -93.27226162826636, -93.15650797005495,
           -91.28751872625006, -122.22964936888202, -122.43151703438164),
  lat = c(45.01013234302003, 44.934866690092, 46.7685422995477, 
          44.92265343749974, 44.82990649338687, 45.10689814136089, 
          44.965000416497965, 44.926752586283584, 47.31420997282805, 37.487084041256715, 37.4321523389281),
  top_3 = c("No", "No", "Yes", "No", "No", "No", "No", "Yes", "No", "Yes", "No")
)
factpal <- colorFactor(topo.colors(3),
                       mackenzie_fav_places$top_3)

leaflet(data = mackenzie_fav_places) %>% 
  addTiles() %>% 
  addCircles(label = ~place,
             lng = ~long, 
             lat = ~lat, 
             weight = 10, 
             opacity = 1, 
             color = ~factpal(top_3)) %>% 
  addPolylines(lat = ~lat,
               lng = ~long,
               color = col2hex("green")) %>% 
  addLegend(pal = factpal, 
            values = ~top_3,
            opacity = 0.5,
            title = "Top 3 Favorite Place?",
            position = "bottomleft")

I ordered the points so that California, my home, connects to the Superior Hiking Trail, the first place I ever visited in Minnesota during my preorientation Macward Bound trip in the summer of 2018.

Revisiting old datasets

This section will revisit some datasets we have used previously and bring in a mapping component.

Bicycle-Use Patterns

The data come from Washington, DC and cover the last quarter of 2014.

Two data tables are available:

  • Trips contains records of individual rentals
  • Stations gives the locations of the bike rental stations

Here is the code to read in the data. We do this a little differently than usualy, which is why it is included here rather than at the top of this file. To avoid repeatedly re-reading the files, start the data import chunk with {r cache = TRUE} rather than the usual {r}. This code reads in the large dataset right away.

data_site <- 
  "https://www.macalester.edu/~dshuman1/data/112/2014-Q4-Trips-History-Data.rds" 
Trips <- readRDS(gzcon(url(data_site)))
Stations<-read_csv("http://www.macalester.edu/~dshuman1/data/112/DC-Stations.csv")
  1. Use the latitude and longitude variables in Stations to make a visualization of the total number of departures from each station in the Trips data. Use either color or size to show the variation in number of departures. This time, plot the points on top of a map. Use any of the mapping tools you’d like.
joined_data_sets <- Trips %>% 
  left_join(Stations, 
            by=c("sstation"="name")) %>% 
  group_by(lat, long) %>% 
  summarize(n = n()) 


washington_dc <- get_stamenmap(
    bbox = c(left = -77.3586, bottom = 38.7523, right = -76.6603, top = 39.0361), 
    maptype = "toner-2010",
    zoom = 11)

ggmap(washington_dc) +
   geom_point(data = joined_data_sets, 
             aes(x = long, 
                 y = lat, 
                 color = n),
             alpha = 1, 
             size = .7) +
  theme_map() +
  scale_colour_viridis_c(option = "inferno") +
  labs(title = "Total Number of Departures From Each Station",
       fill = guide_legend("Number of Departures")) #this did not work and I could not figure out how to change the title of the legend. 

  1. Only 14.4% of the trips in our data are carried out by casual users. Create a plot that shows which area(s) have stations with a much higher percentage of departures by casual users. What patterns do you notice? Also plot this on top of a map. I think it will be more clear what the patterns are.
proportion_data <- Trips %>% 
  left_join(Stations, 
            by=c("sstation"="name")) %>% 
  group_by(lat, long) %>% 
  summarize(n = n(), 
            prop_casual = mean(client == "Casual")) 


proportion_data %>% 
  ggplot(aes(x = long, 
             y = lat, 
             color = prop_casual)) +
  geom_point(shape = 17) +
  labs(x = "Longitude", 
       y = "Latitude", 
       title = "Departures from Stations By Casual Users")

ggmap(washington_dc) +
   geom_point(data = proportion_data, 
             aes(x = long, 
                 y = lat, 
                 color = prop_casual),
             alpha = 1, 
             size = .7) +
  labs(title = "Departures From Stations By Casual Users",
       fill = guide_legend("Proportion of Casual Users")) #again, couldn't figure out how to change the label of the legend +

   theme_map() 
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COVID-19 data

The following exercises will use the COVID-19 data from the NYT.

  1. Create a map that colors the states by the most recent cumulative number of COVID-19 cases (remember, these data report cumulative numbers so you don’t need to compute that). Describe what you see. What is the problem with this map?
states_map <- map_data("state")

state_covid <- covid19 %>%
  group_by(state) %>% 
  slice_max(order_by = date,
            n = 1) %>% 
  mutate(state_name = str_to_lower(state))

state_covid %>% 
  ggplot() +
  geom_map(map = states_map,
           aes(map_id = state_name,
               fill = cases)) +
  #This assures the map looks decently nice:
  expand_limits(x = states_map$long, y = states_map$lat) + 
  theme_map() +
  labs(title = "Most Recent Cumulative COVID Cases By State",
       fill = "Case Count",
       caption = "Created by Mackenzie Clarke")

This map shows that California, Texas, and New York have the highest case count in the United States. The problem with this map is that it does not account for the population of each state. This data is misleading because of this as CA, TX and NY have the highest populations in the country.

  1. Now add the population of each state to the dataset and color the states by most recent cumulative cases/10,000 people. See the code for doing this with the Starbucks data. You will need to make some modifications.
states_map <- map_data("state")

state_covid %>%
    mutate(state_name = str_to_lower(state)) %>% 
  left_join(census_pop_est_2018, 
            by = c("state_name" = "state")) %>% 
  mutate(covid_10000 = (cases/est_pop_2018)*10000) %>%
   group_by(state) %>% 
  slice_max(order_by = date,
            n = 1) %>% 
  ggplot() +
  geom_map(map = states_map,
           aes(map_id = state_name,
               fill = covid_10000)) +
  #This assures the map looks decently nice:
  expand_limits(x = states_map$long, y = states_map$lat) + 
  theme_map() +
  labs(title = "Most Recent Cumulative COVID Cases By State",
       fill = "Cases Per 10,000",
       caption = "Created by Mackenzie Clarke")

  1. CHALLENGE Choose 4 dates spread over the time period of the data and create the same map as in exercise 12 for each of the dates. Display the four graphs together using faceting. What do you notice?

Minneapolis police stops

These exercises use the datasets MplsStops and MplsDemo from the carData library. Search for them in Help to find out more information.

  1. Use the MplsStops dataset to find out how many stops there were for each neighborhood and the proportion of stops that were for a suspicious vehicle or person. Sort the results from most to least number of stops. Save this as a dataset called mpls_suspicious and display the table.
data("MplsStops")
data("MplsDemo")
mpls_suspicious <- MplsStops %>%
  group_by(neighborhood) %>%
  mutate(stops = n(), 
            prop_suspicious = mean(problem == "suspicious")) %>% 
  arrange(desc(stops))

mpls_suspicious
  1. Use a leaflet map and the MplsStops dataset to display each of the stops on a map as a small point. Color the points differently depending on whether they were for suspicious vehicle/person or a traffic stop (the problem variable). HINTS: use addCircleMarkers, set stroke = FAlSE, use colorFactor() to create a palette.
factorpal <- colorFactor(topo.colors(5), MplsStops$problem)

leaflet(data = MplsStops) %>% 
  addTiles() %>% 
  addCircleMarkers(lng = ~long,
                   lat = ~lat,
                   label = ~neighborhood,
                   weight = 1,
                   opacity = 1,
                   stroke = FALSE, 
                   color = ~factorpal(problem)) %>% 
  addLegend(pal = factorpal,
            values = ~problem,
            opacity = 0.5,
            title = NULL,
            position = "bottomleft")
  1. Save the folder from moodle called Minneapolis_Neighborhoods into your project/repository folder for this assignment. Make sure the folder is called Minneapolis_Neighborhoods. Use the code below to read in the data and make sure to delete the eval=FALSE. Although it looks like it only links to the .sph file, you need the entire folder of files to create the mpls_nbhd data set. These data contain information about the geometries of the Minneapolis neighborhoods. Using the mpls_nbhd dataset as the base file, join the mpls_suspicious and MplsDemo datasets to it by neighborhood (careful, they are named different things in the different files). Call this new dataset mpls_all.
mpls_nbhd <- st_read("Minneapolis_Neighborhoods/Minneapolis_Neighborhoods.shp", quiet = TRUE)
mpls_all <- mpls_nbhd %>%
  left_join(mpls_suspicious, 
            by = c("BDNAME" = "neighborhood")) %>%
  left_join(MplsDemo, 
            by = c("BDNAME" = "neighborhood"))
mpls_all
  1. Use leaflet to create a map from the mpls_all data that colors the neighborhoods by prop_suspicious. Display the neighborhood name as you scroll over it. Describe what you observe in the map.
palnumer <- colorNumeric("magma", 
                         domain = mpls_all$prop_suspicious)

leaflet(data = mpls_all) %>% 
  addTiles() %>% 
  addCircles(lng = ~long,
             lat = ~lat,
             label = ~BDNAME, 
             color = ~palnumer(prop_suspicious)) %>% 
  addLegend(pal = palnumer,
            values = ~prop_suspicious,
            position = "bottomleft",
            title = "Proportion Suspicious")

There is a clear demarcation between neighborhoods in the proportion of suspicious police stops. I suspect that there is likely correlation between the neighborhoods with darker dots (majority traffic stops instead of suspicious stops) and the demographic of that neighborhood as it has been statistically suggested that police departments are more likely to stop people of color for suspicious violations.

  1. Use leaflet to create a map of your own choosing. Come up with a question you want to try to answer and use the map to help answer that question. Describe what your map shows.
palnumer <- colorNumeric("magma",
                          domain = mpls_all$prop_suspicious)

leaflet(data = mpls_all) %>% 
  addTiles() %>% 
  addCircles(lng = ~long,
             lat = ~lat,
             label = ~race, 
             color = ~palnumer(prop_suspicious)) %>% 
  addLegend(pal = palnumer,
            values = ~prop_suspicious,
            position = "bottomleft",
            title = "Proportion Suspicious")

Instead of coloring by neighborhood name, I colored by race in this map to see if I could identify any trends that I talked about in the previous problem (i.e if the areas with higher proportion suspicious stops was a larger demographic of people of color). This map is not perfect, but the results were interesting.

---
title: 'Weekly Exercises #4'
author: "Mackenzie Clarke"
output: 
  html_document:
    keep_md: TRUE
    toc: TRUE
    toc_float: TRUE
    df_print: paged
    code_download: true
---


```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE, error=TRUE, message=FALSE, warning=FALSE)
```

```{r libraries}
library(tidyverse)     # for data cleaning and plotting
library(lubridate)     # for date manipulation
library(openintro)     # for the abbr2state() function
library(palmerpenguins)# for Palmer penguin data
library(maps)          # for map data
library(ggmap)         # for mapping points on maps
library(gplots)        # for col2hex() function
library(RColorBrewer)  # for color palettes
library(sf)            # for working with spatial data
library(leaflet)       # for highly customizable mapping
library(carData)       # for Minneapolis police stops data
library(ggthemes)      # for more themes (including theme_map())
theme_set(theme_minimal())
```

```{r data}
# Starbucks locations
Starbucks <- read_csv("https://www.macalester.edu/~ajohns24/Data/Starbucks.csv")

starbucks_us_by_state <- Starbucks %>% 
  filter(Country == "US") %>% 
  count(`State/Province`) %>% 
  mutate(state_name = str_to_lower(abbr2state(`State/Province`))) 

# Lisa's favorite St. Paul places - example for you to create your own data
favorite_stp_by_lisa <- tibble(
  place = c("Home", "Macalester College", "Adams Spanish Immersion", 
            "Spirit Gymnastics", "Bama & Bapa", "Now Bikes",
            "Dance Spectrum", "Pizza Luce", "Brunson's"),
  long = c(-93.1405743, -93.1712321, -93.1451796, 
           -93.1650563, -93.1542883, -93.1696608, 
           -93.1393172, -93.1524256, -93.0753863),
  lat = c(44.950576, 44.9378965, 44.9237914,
          44.9654609, 44.9295072, 44.9436813, 
          44.9399922, 44.9468848, 44.9700727)
  )

#COVID-19 data from the New York Times
covid19 <- read_csv("https://raw.githubusercontent.com/nytimes/covid-19-data/master/us-states.csv")

```

## Put your homework on GitHub!

If you were not able to get set up on GitHub last week, go [here](https://github.com/llendway/github_for_collaboration/blob/master/github_for_collaboration.md) and get set up first. Then, do the following (if you get stuck on a step, don't worry, I will help! You can always get started on the homework and we can figure out the GitHub piece later):

* Create a repository on GitHub, giving it a nice name so you know it is for the 4th weekly exercise assignment (follow the instructions in the document/video).  
* Copy the repo name so you can clone it to your computer. In R Studio, go to file --> New project --> Version control --> Git and follow the instructions from the document/video.  
* Download the code from this document and save it in the repository folder/project on your computer.  
* In R Studio, you should then see the .Rmd file in the upper right corner in the Git tab (along with the .Rproj file and probably .gitignore).  
* Check all the boxes of the files in the Git tab under Stage and choose commit.  
* In the commit window, write a commit message, something like "Initial upload" would be appropriate, and commit the files.  
* Either click the green up arrow in the commit window or close the commit window and click the green up arrow in the Git tab to push your changes to GitHub.  
* Refresh your GitHub page (online) and make sure the new documents have been pushed out.  
* Back in R Studio, knit the .Rmd file. When you do that, you should have two (as long as you didn't make any changes to the .Rmd file, in which case you might have three) files show up in the Git tab - an .html file and an .md file. The .md file is something we haven't seen before and is here because I included `keep_md: TRUE` in the YAML heading. The .md file is a markdown (NOT R Markdown) file that is an interim step to creating the html file. They are displayed fairly nicely in GitHub, so we want to keep it and look at it there. Click the boxes next to these two files, commit changes (remember to include a commit message), and push them (green up arrow).  
* As you work through your homework, save and commit often, push changes occasionally (maybe after you feel finished with an exercise?), and go check to see what the .md file looks like on GitHub.  
* If you have issues, let me know! This is new to many of you and may not be intuitive at first. But, I promise, you'll get the hang of it! 


## Instructions

* Put your name at the top of the document. 

* **For ALL graphs, you should include appropriate labels.** 

* Feel free to change the default theme, which I currently have set to `theme_minimal()`. 

* Use good coding practice. Read the short sections on good code with [pipes](https://style.tidyverse.org/pipes.html) and [ggplot2](https://style.tidyverse.org/ggplot2.html). **This is part of your grade!**

* When you are finished with ALL the exercises, uncomment the options at the top so your document looks nicer. Don't do it before then, or else you might miss some important warnings and messages.


## Warm-up exercises from tutorial

These exercises will reiterate what you learned in the "Mapping data with R" tutorial. If you haven't gone through the tutorial yet, you should do that first.

### Starbucks locations (`ggmap`)

  1. Add the `Starbucks` locations to a world map. Add an aesthetic to the world map that sets the color of the points according to the ownership type. What, if anything, can you deduce from this visualization?  


```{r}
world_map <- get_stamenmap(
   bbox = c(left = -180, bottom = -57, right = 179, top = 82.1), 
    maptype = "terrain",
    zoom = 2
)

ggmap(world_map)

#plotting the Starbucks data on my stamen map
ggmap(world_map) + 
  geom_point(data = Starbucks, 
             aes(x = Longitude, 
                 y = Latitude, 
                 color = `Ownership Type`),
             alpha = .3, 
             size = .1) +
  theme_map()
```

**We can deduce that the majority of Starbucks locations in the United States are company owned, whereas the locations in Europe, Asia, and South America appear to be more joint ventures and licensed locations.**

  2. Construct a new map of Starbucks locations in the Twin Cities metro area (approximately the 5 county metro area). 
  
  
```{r}
mn_starbucks <- Starbucks %>% 
  filter(`State/Province` %in% "MN")
```
  
  
```{r}
twin_cities_map <- get_stamenmap(
    bbox = c(left = -94.4699, bottom = 44.4098, right = -91.6766, top = 45.4424), 
    maptype = "terrain",
    zoom = 9)

ggmap(twin_cities_map) +
   geom_point(data = mn_starbucks, 
             aes(x = Longitude, 
                 y = Latitude, 
                 color = `Ownership Type`),
             alpha = 1, 
             size = .7) +
  theme_map()

```

  3. In the Twin Cities plot, play with the zoom number. What does it do?  (just describe what it does - don't actually include more than one map).
  
**The zoom number is connected to the amount of detail that will be shown in the mapping.** 

  4. Try a couple different map types (see `get_stamenmap()` in help and look at `maptype`). Include a map with one of the other map types.  

```{r}
twin_cities_map <- get_stamenmap(
    bbox = c(left = -94.4699, bottom = 44.4098, right = -91.6766, top = 45.4424), 
    maptype = "toner-2010",
    zoom = 9)

ggmap(twin_cities_map) +
   geom_point(data = mn_starbucks, 
             aes(x = Longitude, 
                 y = Latitude),
             alpha = 1, 
             size = .7) +
  theme_map()
```

  5. Add a point to the map that indicates Macalester College and label it appropriately. There are many ways you can do think, but I think it's easiest with the `annotate()` function (see `ggplot2` cheatsheet).

```{r}
macalester_map <- get_stamenmap(
    bbox = c(left = -93.4863, bottom = 44.8185, right = -92.7880, top = 45.0766), 
    maptype = "toner-2010",
    zoom = 11)

ggmap(macalester_map) +
   geom_point(data = mn_starbucks, 
             aes(x = Longitude, 
                 y = Latitude),
             alpha = 1, 
             size = .7) +
  annotate(geom = "text", y = 44.9379, x = -93.1691, label = "Macalester College") +
  theme_map()
```


### Choropleth maps with Starbucks data (`geom_map()`)

The example I showed in the tutorial did not account for population of each state in the map. In the code below, a new variable is created, `starbucks_per_10000`, that gives the number of Starbucks per 10,000 people. It is in the `starbucks_with_2018_pop_est` dataset.

```{r}
census_pop_est_2018 <- read_csv("https://www.dropbox.com/s/6txwv3b4ng7pepe/us_census_2018_state_pop_est.csv?dl=1") %>% 
  separate(state, into = c("dot","state"), extra = "merge") %>% 
  select(-dot) %>% 
  mutate(state = str_to_lower(state))

starbucks_with_2018_pop_est <-
  starbucks_us_by_state %>% 
  left_join(census_pop_est_2018,
            by = c("state_name" = "state")) %>% 
  mutate(starbucks_per_10000 = (n/est_pop_2018)*10000)
```

  6. **`dplyr` review**: Look through the code above and describe what each line of code does.
The first line with the read_csv is creating a new dataset, labeled census_pop_est_2018, and reading the data from the URL in. The second line with the separate function (the separate function separates a character variable into multiple variables) removes the dots from the state names. The state data was presented with period preceding the state name and this removes that so the data can be joined with another dataset. The select(-dot) function additionally helps us get rid of the period that precedes the state name. The mutate and str_to_lower function in the next line creates a new column in which the state name is presented as lowercase. The next line begins by creating a new dataset called starbucks_with_2018_pop_est. This new dataset will be created using left_join to join together starbucks_us_by_state with the census population data. We then mutate to add another column that gives us the number of starbucks (n) divided by the estimated population multiplied by 10,000 to allow us to understand the number of starbucks stores per 10,000 people. This accounts for the population of each state. 


  7. Create a choropleth map that shows the number of Starbucks per 10,000 people on a map of the US. Use a new fill color, add points for all Starbucks in the US (except Hawaii and Alaska), add an informative title for the plot, and include a caption that says who created the plot (you!). Make a conclusion about what you observe.
  
```{r}
states_map <- map_data("state")



starbucks_with_2018_pop_est %>% 
  ggplot() +
  geom_map(map = states_map,
           aes(map_id = state_name,
               fill = n/est_pop_2018 * 10000)) +
  geom_point(data = Starbucks %>% filter(`Country` == "US", 
                                         `State/Province` != c("HI", "AK")),
             aes(x = Longitude, y = Latitude),
             size = .05,
             alpha = .2, 
             color = "goldenrod") +
expand_limits(x = states_map$long, y = states_map$lat) + 
  theme_map() +
  labs(title = "Number of Starbucks in Each State per 10,000 People", 
       fill = "" ,
       caption = "Created by Mackenzie Clarke") +
  scale_fill_viridis_c(option = "green")
  theme(legend.background = element_blank())
```
**There is a high density of Starbucks locations in Washington, Oregon, California, Colorado, Nevada, and Arizona. Perhaps this is because people on the East Coast prefer Dunkin Donuts over Starbucks :) Also, Starbucks was founded in Seattle, so maybe there are more Starbucks locations on the West Coast because of this.**

### A few of your favorite things (`leaflet`)

  8. In this exercise, you are going to create a single map of some of your favorite places! The end result will be one map that satisfies the criteria below. 
  
  
  * Create a data set using the `tibble()` function that has 10-15 rows of your favorite places. The columns will be the name of the location, the latitude, the longitude, and a column that indicates if it is in your top 3 favorite locations or not. For an example of how to use `tibble()`, look at the `favorite_stp_by_lisa` I created in the data R code chunk at the beginning.  

  * Create a `leaflet` map that uses circles to indicate your favorite places. Label them with the name of the place. Choose the base map you like best. Color your 3 favorite places differently than the ones that are not in your top 3 (HINT: `colorFactor()`). Add a legend that explains what the colors mean.  
  
  * Connect all your locations together with a line in a meaningful way (you may need to order them differently in the original data).  
  
  * If there are other variables you want to add that could enhance your plot, do that now.    
  
```{r}
mackenzie_fav_places <- tibble(
   place = c("Hai Hai", "Macalester College", "Bent Paddle Brewery", 
            "Lake Harriet", "True North Ranch", "Pine Tree Apple Orchard",
            "Minneapolis Institute of Art", "The Nook", "Superior Hiking Trail", "Home", "Half Moon Bay"),
  long = c(-93.26259135894995, -93.16940235841348, -92.12048604141492, 
           -93.30612131724241, -92.85301775841815, -92.95486944306221, -93.27226162826636, -93.15650797005495,
           -91.28751872625006, -122.22964936888202, -122.43151703438164),
  lat = c(45.01013234302003, 44.934866690092, 46.7685422995477, 
          44.92265343749974, 44.82990649338687, 45.10689814136089, 
          44.965000416497965, 44.926752586283584, 47.31420997282805, 37.487084041256715, 37.4321523389281),
  top_3 = c("No", "No", "Yes", "No", "No", "No", "No", "Yes", "No", "Yes", "No")
)
```


```{r}

factpal <- colorFactor(topo.colors(3),
                       mackenzie_fav_places$top_3)

leaflet(data = mackenzie_fav_places) %>% 
  addTiles() %>% 
  addCircles(label = ~place,
             lng = ~long, 
             lat = ~lat, 
             weight = 10, 
             opacity = 1, 
             color = ~factpal(top_3)) %>% 
  addPolylines(lat = ~lat,
               lng = ~long,
               color = col2hex("green")) %>% 
  addLegend(pal = factpal, 
            values = ~top_3,
            opacity = 0.5,
            title = "Top 3 Favorite Place?",
            position = "bottomleft")
```

**I ordered the points so that California, my home, connects to the Superior Hiking Trail, the first place I ever visited in Minnesota during my preorientation Macward Bound trip in the summer of 2018.**

  
## Revisiting old datasets

This section will revisit some datasets we have used previously and bring in a mapping component. 

### Bicycle-Use Patterns

The data come from Washington, DC and cover the last quarter of 2014.

Two data tables are available:

- `Trips` contains records of individual rentals
- `Stations` gives the locations of the bike rental stations

Here is the code to read in the data. We do this a little differently than usualy, which is why it is included here rather than at the top of this file. To avoid repeatedly re-reading the files, start the data import chunk with `{r cache = TRUE}` rather than the usual `{r}`. This code reads in the large dataset right away.

```{r cache=TRUE}
data_site <- 
  "https://www.macalester.edu/~dshuman1/data/112/2014-Q4-Trips-History-Data.rds" 
Trips <- readRDS(gzcon(url(data_site)))
Stations<-read_csv("http://www.macalester.edu/~dshuman1/data/112/DC-Stations.csv")
```

  9. Use the latitude and longitude variables in `Stations` to make a visualization of the total number of departures from each station in the `Trips` data. Use either color or size to show the variation in number of departures. This time, plot the points on top of a map. Use any of the mapping tools you'd like.
  
```{r}

joined_data_sets <- Trips %>% 
  left_join(Stations, 
            by=c("sstation"="name")) %>% 
  group_by(lat, long) %>% 
  summarize(n = n()) 


washington_dc <- get_stamenmap(
    bbox = c(left = -77.3586, bottom = 38.7523, right = -76.6603, top = 39.0361), 
    maptype = "toner-2010",
    zoom = 11)

ggmap(washington_dc) +
   geom_point(data = joined_data_sets, 
             aes(x = long, 
                 y = lat, 
                 color = n),
             alpha = 1, 
             size = .7) +
  theme_map() +
  scale_colour_viridis_c(option = "inferno") +
  labs(title = "Total Number of Departures From Each Station",
       fill = guide_legend("Number of Departures")) #this did not work and I could not figure out how to change the title of the legend. 


```
  
  10. Only 14.4% of the trips in our data are carried out by casual users. Create a plot that shows which area(s) have stations with a much higher percentage of departures by casual users. What patterns do you notice? Also plot this on top of a map. I think it will be more clear what the patterns are.
  
```{r}

proportion_data <- Trips %>% 
  left_join(Stations, 
            by=c("sstation"="name")) %>% 
  group_by(lat, long) %>% 
  summarize(n = n(), 
            prop_casual = mean(client == "Casual")) 


proportion_data %>% 
  ggplot(aes(x = long, 
             y = lat, 
             color = prop_casual)) +
  geom_point(shape = 17) +
  labs(x = "Longitude", 
       y = "Latitude", 
       title = "Departures from Stations By Casual Users")


ggmap(washington_dc) +
   geom_point(data = proportion_data, 
             aes(x = long, 
                 y = lat, 
                 color = prop_casual),
             alpha = 1, 
             size = .7) +
  labs(title = "Departures From Stations By Casual Users",
       fill = guide_legend("Proportion of Casual Users")) #again, couldn't figure out how to change the label of the legend +
   theme_map() 
 

```
  
### COVID-19 data

The following exercises will use the COVID-19 data from the NYT.

  11. Create a map that colors the states by the most recent cumulative number of COVID-19 cases (remember, these data report cumulative numbers so you don't need to compute that). Describe what you see. What is the problem with this map?

```{r}
states_map <- map_data("state")

state_covid <- covid19 %>%
  group_by(state) %>% 
  slice_max(order_by = date,
            n = 1) %>% 
  mutate(state_name = str_to_lower(state))

state_covid %>% 
  ggplot() +
  geom_map(map = states_map,
           aes(map_id = state_name,
               fill = cases)) +
  #This assures the map looks decently nice:
  expand_limits(x = states_map$long, y = states_map$lat) + 
  theme_map() +
  labs(title = "Most Recent Cumulative COVID Cases By State",
       fill = "Case Count",
       caption = "Created by Mackenzie Clarke")

```

**This map shows that California, Texas, and New York have the highest case count in the United States. The problem with this map is that it does not account for the population of each state. This data is misleading because of this as CA, TX and NY have the highest populations in the country.**

  
  12. Now add the population of each state to the dataset and color the states by most recent cumulative cases/10,000 people. See the code for doing this with the Starbucks data. You will need to make some modifications. 
  
```{r}

states_map <- map_data("state")

state_covid %>%
    mutate(state_name = str_to_lower(state)) %>% 
  left_join(census_pop_est_2018, 
            by = c("state_name" = "state")) %>% 
  mutate(covid_10000 = (cases/est_pop_2018)*10000) %>%
   group_by(state) %>% 
  slice_max(order_by = date,
            n = 1) %>% 
  ggplot() +
  geom_map(map = states_map,
           aes(map_id = state_name,
               fill = covid_10000)) +
  #This assures the map looks decently nice:
  expand_limits(x = states_map$long, y = states_map$lat) + 
  theme_map() +
  labs(title = "Most Recent Cumulative COVID Cases By State",
       fill = "Cases Per 10,000",
       caption = "Created by Mackenzie Clarke")
  
```

  
  13. **CHALLENGE** Choose 4 dates spread over the time period of the data and create the same map as in exercise 12 for each of the dates. Display the four graphs together using faceting. What do you notice?
  
## Minneapolis police stops

These exercises use the datasets `MplsStops` and `MplsDemo` from the `carData` library. Search for them in Help to find out more information.

  14. Use the `MplsStops` dataset to find out how many stops there were for each neighborhood and the proportion of stops that were for a suspicious vehicle or person. Sort the results from most to least number of stops. Save this as a dataset called `mpls_suspicious` and display the table.

```{r}
data("MplsStops")
data("MplsDemo")
```


```{r}
mpls_suspicious <- MplsStops %>%
  group_by(neighborhood) %>%
  mutate(stops = n(), 
            prop_suspicious = mean(problem == "suspicious")) %>% 
  arrange(desc(stops))

mpls_suspicious
  
```
  
  
  
  15. Use a `leaflet` map and the `MplsStops` dataset to display each of the stops on a map as a small point. Color the points differently depending on whether they were for suspicious vehicle/person or a traffic stop (the `problem` variable). HINTS: use `addCircleMarkers`, set `stroke = FAlSE`, use `colorFactor()` to create a palette. 

```{r}

factorpal <- colorFactor(topo.colors(5), MplsStops$problem)

leaflet(data = MplsStops) %>% 
  addTiles() %>% 
  addCircleMarkers(lng = ~long,
                   lat = ~lat,
                   label = ~neighborhood,
                   weight = 1,
                   opacity = 1,
                   stroke = FALSE, 
                   color = ~factorpal(problem)) %>% 
  addLegend(pal = factorpal,
            values = ~problem,
            opacity = 0.5,
            title = NULL,
            position = "bottomleft")
```



  16. Save the folder from moodle called Minneapolis_Neighborhoods into your project/repository folder for this assignment. Make sure the folder is called Minneapolis_Neighborhoods. Use the code below to read in the data and make sure to **delete the `eval=FALSE`**. Although it looks like it only links to the .sph file, you need the entire folder of files to create the `mpls_nbhd` data set. These data contain information about the geometries of the Minneapolis neighborhoods. Using the `mpls_nbhd` dataset as the base file, join the `mpls_suspicious` and `MplsDemo` datasets to it by neighborhood (careful, they are named different things in the different files). Call this new dataset `mpls_all`.

```{r}
mpls_nbhd <- st_read("Minneapolis_Neighborhoods/Minneapolis_Neighborhoods.shp", quiet = TRUE)
```

```{r}
mpls_all <- mpls_nbhd %>%
  left_join(mpls_suspicious, 
            by = c("BDNAME" = "neighborhood")) %>%
  left_join(MplsDemo, 
            by = c("BDNAME" = "neighborhood"))
mpls_all
```


  17. Use `leaflet` to create a map from the `mpls_all` data  that colors the neighborhoods by `prop_suspicious`. Display the neighborhood name as you scroll over it. Describe what you observe in the map.

```{r}
palnumer <- colorNumeric("magma", 
                         domain = mpls_all$prop_suspicious)

leaflet(data = mpls_all) %>% 
  addTiles() %>% 
  addCircles(lng = ~long,
             lat = ~lat,
             label = ~BDNAME, 
             color = ~palnumer(prop_suspicious)) %>% 
  addLegend(pal = palnumer,
            values = ~prop_suspicious,
            position = "bottomleft",
            title = "Proportion Suspicious")
```

**There is a clear demarcation between neighborhoods in the proportion of suspicious police stops. I suspect that there is likely correlation between the neighborhoods with darker dots (majority traffic stops instead of suspicious stops) and the demographic of that neighborhood as it has been statistically suggested that police departments are more likely to stop people of color for suspicious violations.**
  
  18. Use `leaflet` to create a map of your own choosing. Come up with a question you want to try to answer and use the map to help answer that question. Describe what your map shows. 

```{r}
palnumer <- colorNumeric("magma",
                          domain = mpls_all$prop_suspicious)

leaflet(data = mpls_all) %>% 
  addTiles() %>% 
  addCircles(lng = ~long,
             lat = ~lat,
             label = ~race, 
             color = ~palnumer(prop_suspicious)) %>% 
  addLegend(pal = palnumer,
            values = ~prop_suspicious,
            position = "bottomleft",
            title = "Proportion Suspicious")
```

**Instead of coloring by neighborhood name, I colored by race in this map to see if I could identify any trends that I talked about in the previous problem (i.e if the areas with higher proportion suspicious stops was a larger demographic of people of color). This map is not perfect, but the results were interesting.**

  
  
## GitHub link

  19. Below, provide a link to your GitHub page with this set of Weekly Exercises. Specifically, if the name of the file is 04_exercises.Rmd, provide a link to the 04_exercises.md file, which is the one that will be most readable on GitHub.

https://github.com/mackenzieclarke/04_Exercises_Clarke

**DID YOU REMEMBER TO UNCOMMENT THE OPTIONS AT THE TOP?**
